YataiDONNijiiro/Scripts/background/bg_objects/bg_normal.lua

-- YataiDON-HSS override of PyTaikoGreen/background/bg_objects/bg_normal.lua: petal spawn band 260/540 *screen_scale
local BGNormalBase = {}
BGNormalBase.__index = BGNormalBase

function BGNormalBase.new(index, path)
    local self = setmetatable({}, BGNormalBase)
    self.name = "bg_" .. index
    self.path = path or "background"
    tex.load_folder(self.path, "bg_normal/" .. self.name)
    self._id_bg = tex.get_id(self.name, "background") or 0
    return self
end

function BGNormalBase:update(current_time_ms) end

function BGNormalBase:draw()
    tex.draw_texture(self._id_bg)
end

function BGNormalBase:destroy()
    tex.unload_folder(self.path, "bg_normal/" .. self.name)
end

-- Index 0 and 1: background + flicker overlay (animation 9)
local BGNormal01 = setmetatable({}, {__index = BGNormalBase})
BGNormal01.__index = BGNormal01

function BGNormal01.new(index, path)
    local self = setmetatable({}, BGNormal01)
    local base = BGNormalBase.new(index, path)
    for k, v in pairs(base) do self[k] = v end
    self.flicker = tex.get_animation(9)
    self._id_overlay = tex.get_id(self.name, "overlay") or 0
    return self
end

function BGNormal01:update(current_time_ms)
    self.flicker:update(current_time_ms)
end

function BGNormal01:draw()
    tex.draw_texture(self._id_bg)
    tex.draw_texture(self._id_overlay, {fade = self.flicker.attribute})
end

-- Index 2: stadium lights with flicker (animation 10)
local BGNormal2 = setmetatable({}, {__index = BGNormalBase})
BGNormal2.__index = BGNormal2

function BGNormal2.new(index, path)
    local self = setmetatable({}, BGNormal2)
    local base = BGNormalBase.new(index, path)
    for k, v in pairs(base) do self[k] = v end
    self.flicker = tex.get_animation(10)
    self._id_center       = tex.get_id(self.name, "center") or 0
    self._id_overlay      = tex.get_id(self.name, "overlay") or 0
    self._id_lamps        = tex.get_id(self.name, "lamps") or 0
    self._id_light_orange = tex.get_id(self.name, "light_orange") or 0
    self._id_light_red    = tex.get_id(self.name, "light_red") or 0
    self._id_light_green  = tex.get_id(self.name, "light_green") or 0
    self._id_light_yellow = tex.get_id(self.name, "light_yellow") or 0
    self._id_side_l       = tex.get_id(self.name, "side_l") or 0
    self._id_side_l_2     = tex.get_id(self.name, "side_l_2") or 0
    self._id_side_r       = tex.get_id(self.name, "side_r") or 0
    return self
end

function BGNormal2:update(current_time_ms)
    self.flicker:update(current_time_ms)
end

function BGNormal2:draw()
    local f = self.flicker.attribute
    tex.draw_texture(self._id_bg)
    tex.draw_texture(self._id_center)
    tex.draw_texture(self._id_overlay)
    tex.draw_texture(self._id_lamps, {index = 0})
    tex.draw_texture(self._id_lamps, {index = 1, mirror = "horizontal"})
    tex.draw_texture(self._id_light_orange, {index = 0, fade = f})
    tex.draw_texture(self._id_light_orange, {index = 1, fade = f})
    tex.draw_texture(self._id_light_red,    {fade = f})
    tex.draw_texture(self._id_light_green,  {fade = f})
    tex.draw_texture(self._id_light_orange, {index = 2, fade = f})
    tex.draw_texture(self._id_light_yellow, {index = 0, fade = f})
    tex.draw_texture(self._id_light_yellow, {index = 1, fade = f})
    tex.draw_texture(self._id_side_l)
    tex.draw_texture(self._id_side_l_2)
    tex.draw_texture(self._id_side_r)
end

-- Index 3: cherry blossoms with turtle and petals (animations 11, 12, 13)
local function new_petal(screen_scale, screen_width, screen_height)
    local spawn_point
    repeat
        spawn_point = math.random(0, math.floor(screen_width))
    until spawn_point < 260 * screen_scale or spawn_point > 540 * screen_scale

    local duration = math.random(1400, 2000)
    local dist_x = math.random(math.floor(-300 * screen_scale), math.floor(300 * screen_scale))

    local petal = {
        spawn_point = spawn_point,
        move_x = anim.move(duration, {total_distance = dist_x}),
        move_y = anim.move(duration, {total_distance = math.floor(screen_height / 2)})
    }
    petal.move_x:start()
    petal.move_y:start()
    return petal
end

local BGNormal3 = setmetatable({}, {__index = BGNormalBase})
BGNormal3.__index = BGNormal3

function BGNormal3.new(index, path)
    local self = setmetatable({}, BGNormal3)
    local base = BGNormalBase.new(index, path)
    for k, v in pairs(base) do self[k] = v end
    self.flicker = tex.get_animation(11)
    self.turtle_move = tex.get_animation(12)
    self.turtle_change = tex.get_animation(13)
    self.screen_scale = tex.get_screen_scale()
    self.screen_width = tex.get_screen_width()
    self.screen_height = tex.get_screen_height()
    self.petals = {}
    for _ = 1, 5 do
        table.insert(self.petals, new_petal(self.screen_scale, self.screen_width, self.screen_height))
    end
    self._id_chara  = tex.get_id(self.name, "chara") or 0
    self._id_turtle = tex.get_id(self.name, "turtle") or 0
    self._id_overlay= tex.get_id(self.name, "overlay") or 0
    self._id_petal  = tex.get_id(self.name, "petal") or 0
    return self
end

function BGNormal3:update(current_time_ms)
    self.flicker:update(current_time_ms)
    self.turtle_move:update(current_time_ms)
    self.turtle_change:update(current_time_ms)
    for i = #self.petals, 1, -1 do
        local petal = self.petals[i]
        petal.move_x:update(current_time_ms)
        petal.move_y:update(current_time_ms)
        if petal.move_y.is_finished then
            table.remove(self.petals, i)
            table.insert(self.petals, new_petal(self.screen_scale, self.screen_width, self.screen_height))
        end
    end
end

function BGNormal3:draw()
    tex.draw_texture(self._id_bg)
    tex.draw_texture(self._id_chara)
    tex.draw_texture(self._id_turtle, {
        frame = self.turtle_change.attribute,
        x = self.turtle_move.attribute
    })
    tex.draw_texture(self._id_overlay)
    for _, petal in ipairs(self.petals) do
        tex.draw_texture(self._id_petal, {
            x = petal.spawn_point + petal.move_x.attribute,
            y = self.screen_height / 2 + petal.move_y.attribute,
            fade = 0.75
        })
    end
end

-- Index 4: paper lanterns with flicker (animation 14)
local BGNormal4 = setmetatable({}, {__index = BGNormalBase})
BGNormal4.__index = BGNormal4

-- ROUND 58 (r58-2p-background-polish): the glow PERIOD is cabinet-true now.
-- The shared animation.json id 14 breathes over 166.7 ms halves; the cabinet's
-- bg_nomal_a_05 glow (sprite 15) is a 50-frame cycle at 60 fps -- 25 frames
-- down, 25 up = 416.7 ms halves (the number the old in-file C-list note
-- carried). Rather than fork the parent's shared animation file, this class
-- keeps its own linear triangle phase and no longer reads anim 14 at all;
-- the 0.5 .. 0.164 endpoints below are the same measured pair as before.
local GLOW_HALF_MS = 25000 / 60  -- 25 cabinet frames

function BGNormal4.new(index, path)
    local self = setmetatable({}, BGNormal4)
    local base = BGNormalBase.new(index, path)
    for k, v in pairs(base) do self[k] = v end
    self.glow_phase_ms = 0
    self.glow_last_ms  = nil
    self._id_paper_lamp   = tex.get_id(self.name, "paper_lamp") or 0
    self._id_light_overlay= tex.get_id(self.name, "light_overlay") or 0
    self._id_overlay      = tex.get_id(self.name, "overlay") or 0
    self._id_lamp_overlay = tex.get_id(self.name, "lamp_overlay") or 0
    self._id_lamp         = tex.get_id(self.name, "lamp") or 0
    return self
end

function BGNormal4:update(current_time_ms)
    if self.glow_last_ms then
        local dt = current_time_ms - self.glow_last_ms
        if dt > 0 then
            self.glow_phase_ms = (self.glow_phase_ms + dt) % (2 * GLOW_HALF_MS)
        end
    end
    self.glow_last_ms = current_time_ms
end

-- ROUND 18, item 3. The cabinet's ten lantern glows (bg_nomal_a_05 shape 13, char 15)
-- are NOT on a regular grid: each has its own scale and five of them are mirrored.
-- Measured with `lumen_anim_dump.exe enso_normal/enso/background/bg_nomal_a_05.nulm
-- --all --leaves`; the registration is the shape's TOP-LEFT (verified against a
-- `lumen_shape_dump -m` composite: all ten halo centres land on tx + 113*s, or
-- tx - 113*s for the mirrored ones). texture.json carries the top-left, this table
-- carries the scale and the mirror. The cabinet composites them ADDITIVELY.
local BG4_GLOW = {
    -- {scale, mirrored}   index 0..9 == texture.json light_overlay entry 0..9
    {0.95, true}, {1.25, true}, {1.00, true}, {1.15, true}, {0.90, true},
    {0.90, false}, {1.10, false}, {1.05, false}, {1.25, false}, {1.00, false},
}

function BGNormal4:draw()
    tex.draw_texture(self._id_bg)
    for i = 0, 9 do
        tex.draw_texture(self._id_paper_lamp, {frame = 9 - i, index = i})
    end
    -- The cabinet's glow alpha breathes over 0.5 .. 0.164 (sprite 15, 50
    -- frames). ROUND 58: driven by this class's own 416.7 ms-half triangle
    -- (see GLOW_HALF_MS above) -- the old shared-anim-14 remap kept the
    -- arcade RANGE but ran at the parent's 166.7 ms period (was C-list).
    local p = self.glow_phase_ms / GLOW_HALF_MS       -- 0..2
    if p > 1 then p = 2 - p end                        -- triangle 0..1..0
    local ga = 0.5 - p * (0.5 - 0.164)                 -- 0.5 dim to 0.164, back
    if ga < 0 then ga = 0 elseif ga > 1 then ga = 1 end
    for i = 0, 9 do
        local g = BG4_GLOW[i + 1]
        tex.draw_texture(self._id_light_overlay, {
            index = i, fade = ga, scale = g[1], blend = "additive",
            mirror = g[2] and "horizontal" or "none",
        })
    end
    -- shape 8 (the eave glow) and shape 3 (the stone-lantern glows) are additive at
    -- full alpha on the cabinet, not 0.75 alpha-blended.
    tex.draw_texture(self._id_overlay,      {blend = "additive"})
    tex.draw_texture(self._id_lamp_overlay, {index = 0, blend = "additive"})
    tex.draw_texture(self._id_lamp_overlay, {index = 1, blend = "additive"})
    tex.draw_texture(self._id_lamp, {index = 0})
    tex.draw_texture(self._id_lamp, {index = 1})
end

local BGNormal = {}
BGNormal.Base = BGNormalBase
BGNormal.BGNormal2 = BGNormal2

-- Exact replay of the cabinet movie (bg_data/bg_anim/bg_N.lua) when exported;
-- the hand-built classes below stay as the fallback.
local ok_anim, BGAnim = pcall(require, "background/bg_objects/bg_anim")
if not ok_anim or type(BGAnim) ~= "table" then BGAnim = nil end

local BGNormalAnim = {}
BGNormalAnim.__index = BGNormalAnim
function BGNormalAnim.new(index, path)
    local anim = BGAnim.new("bg_" .. index, path)
    if not anim then return nil end
    return setmetatable({ anim = anim, name = "bg_" .. index }, BGNormalAnim)
end
function BGNormalAnim:update(current_time_ms) self.anim:update(current_time_ms) end
function BGNormalAnim:draw() self.anim:draw(1.0) end
function BGNormalAnim:destroy() self.anim:destroy() end

function BGNormal.create(index, path)
    if BGAnim and (path or "background") == "background" and BGAnim.available("bg_" .. index) then
        local obj = BGNormalAnim.new(index, path)
        if obj then return obj end
    end
    local map = {BGNormal01, BGNormal01, BGNormal2, BGNormal3, BGNormal4}
    return map[index + 1].new(index, path)
end

return BGNormal